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Blockbusters and Wallflowers: Speeding up Diverse and Accurate Recommendations with Random Walks


Christoffel, Fabian; Paudel, Bibek; Newell, Chris; Bernstein, Abraham (2015). Blockbusters and Wallflowers: Speeding up Diverse and Accurate Recommendations with Random Walks. In: 9th ACM Conference on Recommender Systems RecSys 2015, Vienna, 16 September 2015 - 20 September 2015.

Abstract

User satisfaction is often dependent on providing accurate and diverse recommendations. In this paper, we explore algorithms that exploit random walks as a sampling technique to obtain diverse recommendations without compromising on efficiency and accuracy. Specifically, we present a novel graph vertex ranking recommendation algorithm called RP3β that re-ranks items based on 3-hop random walk transition probabilities. We show empirically, that RP3β provides accu- rate recommendations with high long-tail item frequency at the top of the recommendation list. We also present approx- imate versions of RP3β and the two most accurate previously published vertex ranking algorithms based on random walk transition probabilities and show that these approximations converge with increasing number of samples.

Abstract

User satisfaction is often dependent on providing accurate and diverse recommendations. In this paper, we explore algorithms that exploit random walks as a sampling technique to obtain diverse recommendations without compromising on efficiency and accuracy. Specifically, we present a novel graph vertex ranking recommendation algorithm called RP3β that re-ranks items based on 3-hop random walk transition probabilities. We show empirically, that RP3β provides accu- rate recommendations with high long-tail item frequency at the top of the recommendation list. We also present approx- imate versions of RP3β and the two most accurate previously published vertex ranking algorithms based on random walk transition probabilities and show that these approximations converge with increasing number of samples.

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Additional indexing

Item Type:Conference or Workshop Item (Paper), refereed, original work
Communities & Collections:03 Faculty of Economics > Department of Informatics
Dewey Decimal Classification:000 Computer science, knowledge & systems
Language:English
Event End Date:20 September 2015
Deposited On:28 Oct 2015 15:57
Last Modified:21 Nov 2017 18:03
Publisher:ACM Press
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1145/2792838.2800180
Related URLs:http://recsys.acm.org/recsys15/
Other Identification Number:merlin-id:12211

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